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197 lines
3.9 KiB
C++
197 lines
3.9 KiB
C++
/*
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* This file is a part of Winix
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2008-2014, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <cstdlib>
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#include <limits.h>
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#include "log.h"
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#include "rebus.h"
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#include "misc.h"
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#include "cur.h"
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namespace Winix
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{
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void Rebus::SetCur(Cur * pcur)
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{
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cur = pcur;
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}
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bool Rebus::InitPair(int a, int b, Item & item)
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{
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wchar_t buffer[100];
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size_t buffer_len = sizeof(buffer) / sizeof(wchar_t);
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bool add = false;
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if( a+b <= 15 )
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{
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swprintf(buffer, buffer_len, L"%d+%d", a, b);
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item.question = buffer;
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item.answer = a+b;
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add = true;
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}
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if( a-b >= 0 )
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{
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swprintf(buffer, buffer_len, L"%d-%d", a, b);
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item.question = buffer;
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item.answer = a-b;
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add = true;
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}
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return add;
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}
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void Rebus::Init()
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{
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int a, b;
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Item item;
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item.key = 0;
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for(a=1 ; a<10 ; ++a)
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{
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for(b=1 ; b<10 ; ++b)
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{
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if( InitPair(a, b, item) )
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{
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table.push_back(item);
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item.key += 1;
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}
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}
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}
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}
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Rebus::Item * Rebus::Rand()
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{
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size_t len = table.size();
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if( len == 0 )
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// empty table, call Init() first
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return 0;
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size_t i = size_t( ((double)rand()*(double)len) / (double(RAND_MAX)+1.0) );
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if( i >= table.size() )
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{
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log << log1 << "Rebus: Rand() index too big" << logend;
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// oops, it should not be greater then table.size()
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return &table[0];
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}
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return &table[0] + i;
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}
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bool Rebus::IsAnswerOk(Rebus::Item * item, const std::wstring & answer)
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{
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if( item == 0 )
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return false;
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wchar_t * end;
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const wchar_t * a = answer.c_str();
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a = SkipWhite(a);
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int value = (int)wcstol(a, &end, 10);
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if( a == end )
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// nothing has been read
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return false;
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log << log2 << "Rebus: your answer is: " << value << logend;
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end = (wchar_t*)SkipWhite(end);
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if( *end != 0 )
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{
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// something is at the end
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return false;
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}
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bool result = (item->answer == value);
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if( result )
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log << log3 << "Rebus: the answer is correct" << logend;
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return result;
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}
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bool Rebus::CheckRebus()
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{
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if( !cur->session )
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return false;
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if( cur->session->puser )
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// logged users don't have to use the rebus
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return true;
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if( cur->session->rebus_checked )
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return true;
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cur->session->rebus_checked = true;
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if( !cur->session->rebus_item )
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{
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log << log1 << "Rebus: rebus not set" << logend;
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return false;
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}
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if( IsAnswerOk(cur->session->rebus_item, cur->request->PostVar(L"rebus")) )
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return true;
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log << log1 << "Rebus: rebus has an incorrect answer, expected: "
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<< cur->session->rebus_item->answer << logend;
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// don't add cur->session->spam_score when the rebus has incorrect answer
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// a user could have made a mistake
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return false;
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}
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} // namespace Winix
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